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Precoated sand mixing process

A technology of coated sand and mixing, applied in manufacturing tools, metal processing equipment, casting and molding equipment, etc., can solve the problems of easy agglomeration, low irritating odor, low roughness, etc., to achieve deodorization performance and prevent The performance of the group is excellent, the irritating odor is small, and the effect of reducing the roughness

Inactive Publication Date: 2014-02-26
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the deficiencies in the background technology, the purpose of the present invention is to overcome the defects of the background technology such as strong pungent odor, long-term storage in high-temperature and high-humidity seasons, easy agglomeration, large roughness, and easy sand sticking on castings, and provides a A coated sand mixing process with less pungent odor, less agglomeration, less roughness, and less sticking of sand on castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A coated sand mixing process, comprising the following steps

[0030] 1) Heat the raw sand, and when the temperature of the sand rises to 140~160°C, put the raw sand into the sand mixer, then add the adhesive to mix the sand and stir for 1~2min to obtain the adhesive sand, while stirring add deodorant;

[0031] 2) Add lubricant to the adhesive sand and mix the sand for 1~2min, cool down the adhesive sand after mixing, add curing agent and mix for 20~40s when the sand temperature of the adhesive sand drops to 105~110°C Obtain curing agent sand after;

[0032] 3) Add a lubricant to the curing agent sand and mix the sand for 1-2 minutes. After mixing, cool the curing agent sand, and when the sand temperature drops below 70°C, the sand will be produced to obtain coated sand;

[0033] The add-on of described bonding agent is 1.5% of former sand gross weight, and the add-on of described deodorant is 20% of bonding agent adding amount, and the adding amount of described curi...

Embodiment 2

[0035] Mixing step is with embodiment 1, and the difference with embodiment 1 is the proportioning of each composition, and difference is as follows:

[0036] The addition of the adhesive is 2% of the total weight of the original sand, the addition of the deodorant is 30% of the addition of the adhesive, and the addition of the curing agent is 15% of the addition of the adhesive. %, the add-on of the lubricant is 4% of the binder add-on, and the composition and weight ratio of the deodorant are: orange oil 60, turpentine oil 25, cedar oil 15, the composition and weight of the lubricant The proportion of parts is: zinc stearate 13, calcium stearate 87.

Embodiment 3

[0038] Mixing step is with embodiment 1, and the difference with embodiment 1 is the proportioning of each composition, and difference is as follows:

[0039] The addition of the adhesive is 2.5% of the total weight of the original sand, the addition of the deodorant is 40% of the addition of the adhesive, and the addition of the curing agent is 20% of the addition of the adhesive. %, the add-on of the lubricant is 6% of the binder add-on, the composition of the deodorant and its weight ratio are: orange oil 70, turpentine oil 20, cedar oil 10, the composition of the lubricant and its weight The proportion of parts is: zinc stearate 10, calcium stearate 90.

[0040] It can be seen that the coated sand produced by the coated sand mixing process of the present invention has the characteristics of small pungent odor, not easy to agglomerate, small roughness, and difficult to stick sand on castings.

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PUM

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Abstract

The invention provides a precoated sand mixing process which is characterized by comprising the following steps: (1) heating crude sand, adding the crude sand into a sand mixing machine after the temperature of the crude sand rises to 140 DEG C -160 DEG C, adding and mixing an adhesive with the sand, stirring for 1-2 minutes to obtain adhesive sand, and adding a deodorant while stirring in a stirring process; (2) adding a lubricant into the adhesive sand, mixing with the sand for 1-2 minutes, cooling down the adhesive sand after being mixed, adding a curing agent when the temperature of the adhesive sand is reduced to be 105-110 DEG C, and mixing for 20-40 seconds so as to obtain curing agent sand; and (3) adding the lubricant into the curing agent sand, mixing with the sand for 1-2 minutes, cooling down the curing agent sand after mixing, and discharging the sand when the temperature of the sand is reduced to be less than 70 DEG C so as to obtain precoated sand, wherein the addition amount of the adhesive is 1.5-2.5% of the total weight of the crude sand, the addition amount of the deodorant is 20-40% of the addition amount of the adhesive, the addition amount of the curing agent is 10-20% of the addition amount of the adhesive, and the addition amount of the lubricant is 2-6% of the addition amount of the adhesive. The precoated sand produced by using the precoated sand mixing process has the characteristics that the pungent smell is little, agglomeration is unlikely to happen, the roughness degree is low, and the sand is unlikely to adhere to a cast piece.

Description

technical field [0001] The invention relates to a core (mold) sand mixing process, in particular to a coating sand mixing process capable of reducing the peculiar smell of the coated sand, and belongs to the field of casting technology. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a layer of solid resin on the surface of the sand before molding. It is widely used in foundry fields such as iron castings. [0003] The Chinese Patent Publication No. CN102921878A discloses a coated sand and its preparation method, which is made of the following raw materials by weight: 40 parts of 50-100 mesh calcined quartz sand, 40-70 mesh mullite high temperature 30 parts of calcined sand, 30 parts of 50-100 mesh chromite sand, 2 parts of phenolic resin, 0.3 part of curing agent, 1 part of additive, in the preparation method, add raw sand, adhesive, curing agent and additive in sequence , through sand unloading, crushing and screenin...

Claims

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Application Information

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IPC IPC(8): B22C5/04B22C1/02
Inventor 浦傲天
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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